Ambisonics 是一系列基于声场的空间谐波分解和各阶近似的空间声系统，其重 放声场方向信息的精确度与系统的复杂程度均随阶数的增加而增加． 由于听觉系统对水 平面空间信息的分辨率较垂直方向高，混合阶 Ambisonics 采用较高阶的空间谐波重构水 平面方向声场，而用较低阶的空间谐波重构垂直方向声场，以实现感知性能与系统复杂性 的折中． 文中以 28 +1 分层式扬声器布置为例，对混合阶 Ambisonics 重放的双耳重构声压 进行分析，并和传统的高阶 Ambisonics 重放及目标声源的情况进行比较，同时进行了虚拟 源定位实验验证． 分析和实验结果表明，对实际中可实现的扬声器数目与布置，与传统的 高阶 Ambisonics 相比，合理设计的混合阶 Ambisonics 在保持非水平方向目标声源重放性 能的同时，可改善水平面目标声源的重放性能． 

Ambisonics is a series of spatial sound systems based on spatial harmonics decomposition and each order approximation of sound field． Both the accuracy of directional information reproduction and the complexity of system increase as the order of Ambisonics increases． Considering that the horizontal resolution of human hearing is higher than that of vertical direction，mixed-order Ambisonics reconstructs horizontal sound field with higher order spatial harmonics，while vertical sound field with lower order spatial harmonics is reconstructed，and thereby a compromise is reached between the perceptual performance and the complexity of system． By taking the 28 +1 layer-wise loudspeaker layout for example， the present work analyzes the binaural pressures in mixed-order Ambisonics reproduction and compares with the case in conventional high-order Ambisonics． When the corresponding binaural pressures in two systems are also compared for various target source directions，the results indicate that，for appropriate design and feasible loudspeaker layout，mixed-order Ambisonics improves the horizontal localization performance，and at the same time maintains the same off-horizontal localization performance as the high order Ambisonics． A series of virtual source localization experiments on Ambisonics reproduction validate the analysis．